tokenbridge-contracts/contracts/upgradeable_contracts/Ownable.sol

70 lines
2.3 KiB
Solidity

pragma solidity 0.4.24;
import "../upgradeability/EternalStorage.sol";
import "../interfaces/IUpgradeabilityOwnerStorage.sol";
/**
* @title Ownable
* @dev This contract has an owner address providing basic authorization control
*/
contract Ownable is EternalStorage {
bytes4 internal constant UPGRADEABILITY_OWNER = 0x6fde8202; // upgradeabilityOwner()
/**
* @dev Event to show ownership has been transferred
* @param previousOwner representing the address of the previous owner
* @param newOwner representing the address of the new owner
*/
event OwnershipTransferred(address previousOwner, address newOwner);
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(msg.sender == owner());
/* solcov ignore next */
_;
}
/**
* @dev Throws if called by any account other than contract itself or owner.
*/
modifier onlyRelevantSender() {
// proxy owner if used through proxy, address(0) otherwise
require(
!address(this).call(abi.encodeWithSelector(UPGRADEABILITY_OWNER)) || // covers usage without calling through storage proxy
msg.sender == IUpgradeabilityOwnerStorage(this).upgradeabilityOwner() || // covers usage through regular proxy calls
msg.sender == address(this) // covers calls through upgradeAndCall proxy method
);
/* solcov ignore next */
_;
}
bytes32 internal constant OWNER = 0x02016836a56b71f0d02689e69e326f4f4c1b9057164ef592671cf0d37c8040c0; // keccak256(abi.encodePacked("owner"))
/**
* @dev Tells the address of the owner
* @return the address of the owner
*/
function owner() public view returns (address) {
return addressStorage[OWNER];
}
/**
* @dev Allows the current owner to transfer control of the contract to a newOwner.
* @param newOwner the address to transfer ownership to.
*/
function transferOwnership(address newOwner) external onlyOwner {
_setOwner(newOwner);
}
/**
* @dev Sets a new owner address
*/
function _setOwner(address newOwner) internal {
require(newOwner != address(0));
emit OwnershipTransferred(owner(), newOwner);
addressStorage[OWNER] = newOwner;
}
}